Direct Synthesis of Amides from Carboxylic Acids and Amines Using B(OCH<sub>2</sub>CF<sub>3</sub>)<sub>3</sub>
作者:Rachel M. Lanigan、Pavel Starkov、Tom D. Sheppard
DOI:10.1021/jo400509n
日期:2013.5.3
range of amines. In most cases, the amide products can be purified by a simple filtration procedure using commercially available resins, with no need for aqueous workup or chromatography. The amidation of N-protected amino acids with both primary and secondary amines proceeds effectively, with very low levels of racemization. B(OCH2CF3)3 can also be used for the formylation of a range of amines in good
Borate esters as convenient reagents for direct amidation of carboxylic acids and transamidation of primary amides
作者:Pavel Starkov、Tom D. Sheppard
DOI:10.1039/c0ob01069c
日期:——
with a variety of carboxylic acids and amines. With trimethyl or tris(2,2,2-trifluoroethyl) borate, amides are obtained in good to excellent yield and high purity after a simple work-up procedure. Tris(2,2,2-trifluoroethyl) borate can also be used for the straightforward conversion of primaryamides to secondary amidesvia transamidation.
Nickel-Catalyzed 1,2-Diarylation of Simple Alkenyl Amides
作者:Joseph Derosa、Roman Kleinmans、Van T. Tran、Malkanthi K. Karunananda、Steven R. Wisniewski、Martin D. Eastgate、Keary M. Engle
DOI:10.1021/jacs.8b11942
日期:2018.12.26
A nickel-catalyzed conjunctive cross-coupling of simple alkenyl amides with aryl iodides and arylboronic esters is reported. The reaction is enabled by an electron-deficient olefin (EDO) ligand, dimethyl fumarate, and delivers the desired 1,2-diarylated products with excellent regiocontrol. Under optimized conditions, a wide range of amides derived from 3-butenoic acid, 4-pentenoic acid, and allyl
报道了简单烯基酰胺与芳基碘化物和芳基硼酸酯的镍催化连接交叉偶联。该反应由缺电子烯烃 (EDO) 配体富马酸二甲酯实现,并提供具有出色区域控制的所需 1,2-二芳基化产物。在优化条件下,衍生自 3-丁烯酸、4-戊烯酸和烯丙胺的多种酰胺都是相容的底物。该方法代表了由天然酰胺官能团引导的区域控制 1,2-二芳基化的第一个例子。计算分析揭示了潜在的底物结合模式和 EDO 配体在还原消除步骤中的作用。